MG & SG Series Boilers – Installation and Service Manual
13
Startup Instructions Section 4
3.1 PRE-STARTUP
a. Fill entire heating system with water and vent or purge air from system. Add water as needed to
reach boiler operating pressure. Water should be of suitable quality. Do not use water with high
hardness.
b. Check for and repair any leaks in water piping.
c. Check burners to see that they are not dislodged.
d. Check for proper installation of pressure relief valve, draft hood, and venting.
e. Check that the electrical wiring matches the wiring diagram in this manual or on the boiler.
f. Check if the flame roll out safety switch and blocked vent safety switch are properly located and
wired.
g. Use a soap solution to check for leaks in gas piping from meter to boiler pilot and manifold. Repair
and retest any leaks found.
h. Operate circulating pump and vent all radiation units and high points in system piping.
3.2 STARTUP
WARNING
The following instructions are intended as a guide for qualified persons. Before lighting the
boiler, the pre-startup instructions of Section 3.1 MUST be performed. If you do not follow these
instructions exactly, a fire or explosion may result causing property damage, personal injury or
loss of life.
WARNING
Should boiler overheat, or the gas supply fail to shut off, do not turn off or disconnect the
electrical supply to the circulating pump. Instead, shut off the gas supply at a location external
to the boiler.
a. Standing pilot
1) Make sure Gas Valve and all electrical power to the boiler are "OFF".
2) Connect a manometer at the pressure tapping on the downstream side of gas valve.
3) Supply gas as far as the pilot only, ignite as per lighting instructions in Section 1.3, and adjust the
pilot as described in "Pilot Flame" in Section 3.3.
4) Set the thermostat above room temperature. Open the gas valve to turn on main burner.
5) Assure that all other gas appliances are turned off, including their pilot flames.
6) Check manifold pressure reading on the manometer and make necessary adjustments. Check
burner input to match rating plate input.
7) Turn Gas Valve to "OFF" and listen for the audible click which signifies that the automatic safety
valve has closed. This should occur within 90 seconds.
8) Before re-lighting, wait 5 minutes with the Gas Valve closed to allow all unburnt gas to vent.
Then smell for gas, including near the floor. If you smell gas, STOP! Follow the safety
instructions provided in Section 1.1 under WHAT TO DO IF YOU SMELL GAS. Remember that
propane does not vent upward naturally.
9) Return thermostat and controls to normal operation settings.
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